A nice piece with very good details.
Obverse: bust of the emperor wearing laurel wreath, armor and paludamentum, to the right, in the rim legend:
IMP ANTONINVS PIVS AVG;
Reverse: walking sol to the left, holds his hand in a gesture of salutation and whip, surrounded by legend:
CONSERVATOR AVG;
Silver, diameter 18 x 20 mm, weight 2.21 g, axis 11 h.